Lock and latch



(No Modl) G. Ri lUHLM.A1\I1\Il LOCKAND 'Il-ATCB.

No. 496,497. Patented May 2*,- 1893.

a fp@ UNITED STATES PATENT OFFICE.

CHARLES R. UHLMANN, OF PEORIA, ILLINOIS.

LOCK AND LATCH.

SPECIFICATION forming part of Letters' Patent No. 496,497, dated May 2, 1893.

Application filed October 18, 1892. Serial No. 449,255. (No model.)

YTo aZZ whom t may concern:

Be it known that I, CHARLES R. UHLMANN, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Mortise and Rim Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which appertains to make and use the same. This invention relates to improvements in locks, of that class ordinarily used on doors and known as mortise and riml locks.

The obj ect of the invention is to provide a safe guard, to render ordinary locks secure against being picked by hooks, wires or the like, all of which will be fully understood after considering the specification and drawings forming part of this application.

In the drawings, Figure lV represents side view of the interior of a rim-lock showing my attachment applied thereto. Fig. 2 represents a side view of the key used on this lock. Fig. 3 is a perspective view of a catch used in my device for closing the key-hole. Fig. 4. is a perspective view of a key guide used in my lock. Fig. 5 is a plan view of the key guide described in Fig. 4.. Fig. 6 is a transverse sectional elevation of the lockpon the line :c .fr Fig. l. Fig. 7 is a side view of the interior of a mortise-lock showing a differently constructed device, applied to one of 'my locks, but embodying the same principle.

In the several gures, (with the exception of Fig. 7) A represents the lock-case, and a represents the usual snap catch which is actuated by the usual knob spindle which is inserted in the aperture a', while c is the spring for keeping the said snap catch thrown outward, and b represents the locking-bolt which is thrown in and out by the ordinary key, and CZ is the tumbler. This construction is rather like an ordinary lock. Now what I term as a guard and key-guide and designated by A is made in the peculiar shape shown in order that the upper portion of the key-hole may be left free by forming in the said guarc the indentation l and the indentation 2 is made to allow of a key-hole closer B, which is ,located in the bottom of the lock, to enter it to allow the tumbler or tumblers to operate freely. A post j is cast with thelock-case, and a notch lo is made in the upper body of the said guard which just allows the guide to en` ter between the said post j and the bottom iange of the lock. This mode of securing the guide, I do not however confine myself to, but screws or rivets may be used instead. The upper portion of this guard A occupies a position immediately between the locking-bolt and the tumbler, at the same time allowing the parts to work freely.

The block B already mentioned used for closing the key-hole is used in my several prior patents in some form or other, hence I do not claim that portion of this patent, except that With the free end thereof is cast an ear or lug C as shown which in the position shown in Fig. 1 also forms a guide for the key in its rotary movement.

It will be seen that the guide portion of the block or guide A occupies a position midway between the two sides of the lock-case as also does the lug C of the block B.

The form of key used is shown in Fig. 2, with the depending ears E E with the slot F between them. The ears E E swing in the space between the guide A (Fig. 6) and either side of the lock-case, while the slot F must necessarily engage with the said guide. By this means it must be seen that the key may reach the locking-bolt and tumbler as easily as in the old style of locks, and at the same time, the lock cannot in any possible manner be picked on account of the guard A.

The block B is used as in my other locks by throwing it past the key-hole to prevent the key being turned from the outside. The block is kept in place by a lug f (Fig. 1) cast with the rim of the lock case which engages with a notch g in the said block, and when the block covers the key-hole the end. g rests behind the said lug f, andthe spring Zt andk head t' bearing against the lip Z (cast with the lock-case) keep the said block B down to its place.

The guide A and lug C may be made with a lip or flange 3 and 4 respectively cast on one or both sides thereof or in some similar IOO shape applied at one or more different places to prevent the use of any other key than the one especially designed for that lock.

In Fig. 7, b represents the locking-bolt, al the tumbler and B the key-hole closer and A:j shows a diierent form of guide for the different shaped lock but in other respects the device is the same.

The sliding block B Fig. 7 may be placed on the opposite side of the key-hole by cutting said block in two and using the end bearing the lug C and the said lug C may be made to curve up over the key-hole as the guard A does, instead of the shape it now has, to take the place of the block A Fig. l and A:5 Fig. 7.

What I claim as new, and desire to secure by Letters Patent, is-

In a mortise or riin lock, the combination with the case A, the bolt b and tumbler CZ, of the movable sliding block B with the lug C, said block being held by the spring h, the guide A of the forln of an inverted L having the indent-ation l, the indentation 2 to admit the lug C of the block B, said guide A occupying a position between the bolt I) and tumbier d respectively to prevent the picking of the lock and all being substantially of the form shown and all working together in the manner and for the purposes described.

In testimony whereof I affix my signatu re in presence of two witnesses.

CHARLES R. UHLMANN.

Witnesses:

JOHN D. Snr/mnu, A. KEITHLEY. 

